Free tool
Startup Runway Calculator
Cash on hand, monthly burn — how long until zero.
Runway is the number every founder should know cold: how many months of cash you have left at your current burn. Enter two numbers to find out.
Runway = cash on hand divided by monthly net burn (what you spend minus what you bring in).
If you're profitable — bringing in more than you spend — your runway is effectively infinite, and this calculator will tell you so.
A common rule of thumb: start raising or cutting when you hit roughly six months of runway, because closing a round or finding profitability almost always takes longer than you expect.
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Common questions
How do I calculate startup runway?
Divide your cash on hand by your monthly net burn (what you spend minus what you bring in) — that's how many months you have left. Enter both numbers above for your runway and zero-cash date.
What is a good amount of runway?
Most founders aim to keep at least six months of runway. Start raising or cutting costs when you hit it, because closing a round or reaching profitability almost always takes longer than expected.
What is burn rate?
Burn rate is how much cash you lose each month — spending minus revenue. If you bring in more than you spend, your burn is negative and your runway is effectively infinite.